if (!(navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i))) {
    var headHTML = document.head.innerHTML
    console.log(1)
    headHTML += '<link type="text/css" rel="stylesheet" href="/css/pc.css">'
    document.head.innerHTML = headHTML
    console.log(document.head.innerHTML)
}